The surface meaning of a word is that word's?
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c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

i just learnt this recently but i need to look through my notes again

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them